fix(telegram): prevent block replies when streaming is disabled

[ivancasco]

Summary

• Fixes issue where block replies were sent even when disableBlockStreaming=true
• This caused TTS audio to be sent as a separate message instead of combined with text when draft streaming was active

Problem

When draft streaming is enabled for Telegram, disableBlockStreaming is set to true. However, the onBlockReply handler was still sending blocks via the else branch, causing:

1. hadBlockReplies=true even though streaming was supposed to be disabled
2. TTS audio being sent as a separate "audio-only" message instead of combined with the final text

Fix

Added a check for blockStreamingEnabled in the else branch so blocks are only sent when streaming is explicitly enabled.

Test plan

• Enable draft streaming + TTS auto in Telegram private chat
• Send a message and verify text appears in draft bubble
• Verify final message has text + audio combined (not separate)

[thewilloftheshadow]

Squash-merged into main.

• Squash commit: 84f8f8b
• Included: skip block replies when streaming is disabled + changelog entry (thanks)
• Tests: pnpm lint && pnpm build && pnpm test (lint failed in existing src/line/* types)

[thewilloftheshadow]

Closed after squash-merge to main (commit 84f8f8b).